I think it is normal
Our little Sosa ( not so little at 3 feet lol ) used to hide all the time, he is only 9 months old now. Just recently we noticed, not this last feed but the one before that, he started staying out most of the time.
We are not sure if he just got too dang big to hide out in there all day lol, or he just got tired of not checking out the scenery but whatever the case, just now at 9 months is he out and about.
From what others suggest though, I would think it is a personal preference of the snake and most likely each is different...kind of like kids... I got one that is a morning person and another that is worse than Oscar the grouch when he has to get up lol.